Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec389cecdc6deb6…

MALICIOUS

PDF

89.1 KB Created: 2021-01-16 14:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 98e064a814bb04d9ecacd66965c1b84e SHA-1: ef4c96f8c4873908e1c0f805a69a3fbface5e5b6 SHA-256: 5ec389cecdc6deb6db3cdd19ada8cb2173fedf2040c5145ae433691bf323f79b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains invisible links that redirect to a CAPTCHA-themed login page, a common lure for phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and contains no readable text, but the presence of multiple external URLs and the heuristic firings point to a credential harvesting or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/aws?utm_term=the+adventures+of+sherlock+holmes+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470038/normal_5fe8c40779775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_5fc33dc30f5f3.pdfIn PDF document text
    • https://joxiwawetesamiv.weebly.com/uploads/1/3/4/3/134306419/ribikasizox-xozomaxexiv-rusirimopaja.pdfIn PDF document text
    • https://site-1168501.mozfiles.com/files/1168501/american_funds_advisor_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/fZggfbm/9999725639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386333/normal_5ff4262230250.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/dixurazalirirol.pdfIn PDF document text
    • https://rusenudiwupelor.weebly.com/uploads/1/3/4/7/134704890/mojekipitov.pdfIn PDF document text
    • https://judixanasagik.weebly.com/uploads/1/3/4/6/134688655/rowuzeb-disozeseto.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/ihijevE/25900065038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jezobasit/article_review_worksheet_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/captcha_login_form_php.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/id_card_design_template_psd.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 5304 bytes
SHA-256: 426e34e0a7eddaa016529f3e19bd790b7387fa26808f24f4b452e4f53b973d53
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 11100 bytes
SHA-256: 9eb58b8f0f4678c77078a1e0ef41dc83b1646b82be9201d26d12a50f99314c5f
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_03_sfnt_off0001463b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463B 6500 bytes
SHA-256: 02385f56a1b3dd3310129ee5153c596bbb6d413fc87db110036293e0f97cf704

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